function FastClick(layer, options) {
	var oldOnClick;
	options = options || {};
	this.trackingClick = false;
	this.trackingClickStart = 0;
	this.targetElement = null;
	this.touchStartX = 0;
	this.touchStartY = 0;
	this.lastTouchIdentifier = 0;
	this.touchBoundary = options.touchBoundary || 10;
	this.layer = layer;
	this.tapDelay = options.tapDelay || 200;
	this.tapTimeout = options.tapTimeout || 700;
	if (FastClick.notNeeded(layer)) {
		return;
	}
	function bind(method, context) {
		return function () { return method.apply(context, arguments); };
	}
	var methods = ['onMouse', 'onClick', 'onTouchStart', 'onTouchMove', 'onTouchEnd', 'onTouchCancel'];
	var context = this;
	for (var i = 0, l = methods.length; i < l; i++) {
		context[methods[i]] = bind(context[methods[i]], context);
	}
	if (deviceIsAndroid) {
		layer.addEventListener('mouseover', this.onMouse, true);
		layer.addEventListener('mousedown', this.onMouse, true);
		layer.addEventListener('mouseup', this.onMouse, true);
	}
	layer.addEventListener('click', this.onClick, true);
	layer.addEventListener('touchstart', this.onTouchStart, false);
	layer.addEventListener('touchmove', this.onTouchMove, false);
	layer.addEventListener('touchend', this.onTouchEnd, false);
	layer.addEventListener('touchcancel', this.onTouchCancel, false);
	if (!Event.prototype.stopImmediatePropagation) {
		layer.removeEventListener = function (type, callback, capture) {
			var rmv = Node.prototype.removeEventListener;
			if (type === 'click') {
				rmv.call(layer, type, callback.hijacked || callback, capture);
			} else {
				rmv.call(layer, type, callback, capture);
			}
		};
		layer.addEventListener = function (type, callback, capture) {
			var adv = Node.prototype.addEventListener;
			if (type === 'click') {
				adv.call(layer, type, callback.hijacked || (callback.hijacked = function (event) {
					if (!event.propagationStopped) {
						callback(event);
					}
				}), capture);
			} else {
				adv.call(layer, type, callback, capture);
			}
		};
	}
	if (typeof layer.onclick === 'function') {
		oldOnClick = layer.onclick;
		layer.addEventListener('click', function (event) {
			oldOnClick(event);
		}, false);
		layer.onclick = null;
	}
}
var deviceIsWindowsPhone = navigator.userAgent.indexOf("Windows Phone") >= 0;
var deviceIsAndroid = navigator.userAgent.indexOf('Android') > 0 && !deviceIsWindowsPhone;
var deviceIsIOS = /iP(ad|hone|od)/.test(navigator.userAgent) && !deviceIsWindowsPhone;
var deviceIsIOS4 = deviceIsIOS && (/OS 4_\d(_\d)?/).test(navigator.userAgent);
var deviceIsIOSWithBadTarget = deviceIsIOS && (/OS [6-7]_\d/).test(navigator.userAgent);
var deviceIsBlackBerry10 = navigator.userAgent.indexOf('BB10') > 0;
FastClick.prototype.needsClick = function (target) {
	switch (target.nodeName.toLowerCase()) {
		case 'button':
		case 'select':
		case 'textarea':
			if (target.disabled) {
				return true;
			}
			break;
		case 'input':
			if ((deviceIsIOS && target.type === 'file') || target.disabled) {
				return true;
			}
			break;
		case 'label':
		case 'iframe': case 'video':
			return true;
		default:
			break;
	}
	return (/\bneedsclick\b/).test(target.className);
};
FastClick.prototype.needsFocus = function (target) {
	switch (target.nodeName.toLowerCase()) {
		case 'textarea':
			return true;
		case 'select':
			return !deviceIsAndroid;
		case 'input':
			switch (target.type) {
				case 'button':
				case 'checkbox':
				case 'file':
				case 'image':
				case 'radio':
				case 'submit':
					return false;
				default:
					break;
			}
			return !target.disabled && !target.readOnly;
		default:
			return (/\bneedsfocus\b/).test(target.className);
	}
};
FastClick.prototype.sendClick = function (targetElement, event) {
	var clickEvent, touch;
	if (document.activeElement && document.activeElement !== targetElement) {
		document.activeElement.blur();
	}
	touch = event.changedTouches[0];
	clickEvent = document.createEvent('MouseEvents');
	clickEvent.initMouseEvent(this.determineEventType(targetElement), true, true, window, 1, touch.screenX, touch.screenY, touch.clientX, touch.clientY, false, false, false, false, 0, null);
	clickEvent.forwardedTouchEvent = true;
	targetElement.dispatchEvent(clickEvent);
};
FastClick.prototype.determineEventType = function (targetElement) {
	if (deviceIsAndroid && targetElement.tagName.toLowerCase() === 'select') {
		return 'mousedown';
	}
	return 'click';
};
FastClick.prototype.focus = function (targetElement) {
	var length;
	if (deviceIsIOS && targetElement.setSelectionRange && targetElement.type.indexOf('date') !== 0 && targetElement.type !== 'time' && targetElement.type !== 'month' && targetElement.type !== 'email') {
		length = targetElement.value.length;
		targetElement.setSelectionRange(length, length);
	} else {
		targetElement.focus();
	}
};
FastClick.prototype.updateScrollParent = function (targetElement) {
	var scrollParent, parentElement;
	scrollParent = targetElement.fastClickScrollParent;
	if (!scrollParent || !scrollParent.contains(targetElement)) {
		parentElement = targetElement;
		do {
			if (parentElement.scrollHeight > parentElement.offsetHeight) {
				scrollParent = parentElement;
				targetElement.fastClickScrollParent = parentElement;
				break;
			}
			parentElement = parentElement.parentElement;
		} while (parentElement);
	}
	if (scrollParent) {
		scrollParent.fastClickLastScrollTop = scrollParent.scrollTop;
	}
};
FastClick.prototype.getTargetElementFromEventTarget = function (eventTarget) {
	if (eventTarget.nodeType === Node.TEXT_NODE) {
		return eventTarget.parentNode;
	}
	return eventTarget;
};
FastClick.prototype.onTouchStart = function (event) {
	var targetElement, touch, selection;
	if (event.targetTouches.length > 1) {
		return true;
	}
	targetElement = this.getTargetElementFromEventTarget(event.target);
	touch = event.targetTouches[0];
	if (deviceIsIOS) {
		selection = window.getSelection();
		if (selection.rangeCount && !selection.isCollapsed) {
			return true;
		}
		if (!deviceIsIOS4) {
			if (touch.identifier && touch.identifier === this.lastTouchIdentifier) {
				event.preventDefault();
				return false;
			}
			this.lastTouchIdentifier = touch.identifier;
			this.updateScrollParent(targetElement);
		}
	}
	this.trackingClick = true;
	this.trackingClickStart = event.timeStamp;
	this.targetElement = targetElement;
	this.touchStartX = touch.pageX;
	this.touchStartY = touch.pageY;
	if ((event.timeStamp - this.lastClickTime) < this.tapDelay) {
		event.preventDefault();
	}
	return true;
};
FastClick.prototype.touchHasMoved = function (event) {
	var touch = event.changedTouches[0], boundary = this.touchBoundary;
	if (Math.abs(touch.pageX - this.touchStartX) > boundary || Math.abs(touch.pageY - this.touchStartY) > boundary) {
		return true;
	}
	return false;
};
FastClick.prototype.onTouchMove = function (event) {
	if (!this.trackingClick) {
		return true;
	}
	if (this.targetElement !== this.getTargetElementFromEventTarget(event.target) || this.touchHasMoved(event)) {
		this.trackingClick = false;
		this.targetElement = null;
	}
	return true;
};
FastClick.prototype.findControl = function (labelElement) {
	if (labelElement.control !== undefined) {
		return labelElement.control;
	}
	if (labelElement.htmlFor) {
		return document.getElementById(labelElement.htmlFor);
	}
	return labelElement.querySelector('button, input:not([type=hidden]), keygen, meter, output, progress, select, textarea');
};
FastClick.prototype.onTouchEnd = function (event) {
	var forElement, trackingClickStart, targetTagName, scrollParent, touch, targetElement = this.targetElement;
	if (!this.trackingClick) {
		return true;
	}
	if ((event.timeStamp - this.lastClickTime) < this.tapDelay) {
		this.cancelNextClick = true;
		return true;
	}
	if ((event.timeStamp - this.trackingClickStart) > this.tapTimeout) {
		return true;
	}
	this.cancelNextClick = false;
	this.lastClickTime = event.timeStamp;
	trackingClickStart = this.trackingClickStart;
	this.trackingClick = false;
	this.trackingClickStart = 0;
	if (deviceIsIOSWithBadTarget) {
		touch = event.changedTouches[0];
		targetElement = document.elementFromPoint(touch.pageX - window.pageXOffset, touch.pageY - window.pageYOffset) || targetElement;
		targetElement.fastClickScrollParent = this.targetElement.fastClickScrollParent;
	}
	targetTagName = targetElement.tagName.toLowerCase();
	if (targetTagName === 'label') {
		forElement = this.findControl(targetElement);
		if (forElement) {
			this.focus(targetElement);
			if (deviceIsAndroid) {
				return false;
			}
			targetElement = forElement;
		}
	} else if (this.needsFocus(targetElement)) {
		if ((event.timeStamp - trackingClickStart) > 100 || (deviceIsIOS && window.top !== window && targetTagName === 'input')) {
			this.targetElement = null;
			return false;
		}
		this.focus(targetElement);
		this.sendClick(targetElement, event);
		if (!deviceIsIOS || targetTagName !== 'select') {
			this.targetElement = null;
			event.preventDefault();
		}
		return false;
	}
	if (deviceIsIOS && !deviceIsIOS4) {
		scrollParent = targetElement.fastClickScrollParent;
		if (scrollParent && scrollParent.fastClickLastScrollTop !== scrollParent.scrollTop) {
			return true;
		}
	}
	if (!this.needsClick(targetElement)) {
		event.preventDefault();
		this.sendClick(targetElement, event);
	}
	return false;
};
FastClick.prototype.onTouchCancel = function () {
	this.trackingClick = false;
	this.targetElement = null;
};
FastClick.prototype.onMouse = function (event) {
	if (!this.targetElement) {
		return true;
	}
	if (event.forwardedTouchEvent) {
		return true;
	}
	if (!event.cancelable) {
		return true;
	}
	if (!this.needsClick(this.targetElement) || this.cancelNextClick) {
		if (event.stopImmediatePropagation) {
			event.stopImmediatePropagation();
		} else {
			event.propagationStopped = true;
		}
		event.stopPropagation();
		event.preventDefault();
		return false;
	}
	return true;
};
FastClick.prototype.onClick = function (event) {
	var permitted;
	if (this.trackingClick) {
		this.targetElement = null;
		this.trackingClick = false;
		return true;
	}
	if (event.target.type === 'submit' && event.detail === 0) {
		return true;
	}
	permitted = this.onMouse(event);
	if (!permitted) {
		this.targetElement = null;
	}
	return permitted;
};
FastClick.prototype.destroy = function () {
	var layer = this.layer;
	if (deviceIsAndroid) {
		layer.removeEventListener('mouseover', this.onMouse, true);
		layer.removeEventListener('mousedown', this.onMouse, true);
		layer.removeEventListener('mouseup', this.onMouse, true);
	}
	layer.removeEventListener('click', this.onClick, true);
	layer.removeEventListener('touchstart', this.onTouchStart, false);
	layer.removeEventListener('touchmove', this.onTouchMove, false);
	layer.removeEventListener('touchend', this.onTouchEnd, false);
	layer.removeEventListener('touchcancel', this.onTouchCancel, false);
};
FastClick.notNeeded = function (layer) {
	var metaViewport;
	var chromeVersion;
	var blackberryVersion;
	var firefoxVersion;
	if (typeof window.ontouchstart === 'undefined') {
		return true;
	}
	chromeVersion = +(/Chrome\/([0-9]+)/.exec(navigator.userAgent) || [undefined, 0])[1];
	if (chromeVersion) {
		if (deviceIsAndroid) {
			metaViewport = document.querySelector('meta[name=viewport]');
			if (metaViewport) {
				if (metaViewport.content.indexOf('user-scalable=no') !== -1) {
					return true;
				}
				if (chromeVersion > 31 && document.documentElement.scrollWidth <= window.outerWidth) {
					return true;
				}
			}
		} else {
			return true;
		}
	}
	if (deviceIsBlackBerry10) {
		blackberryVersion = navigator.userAgent.match(/Version\/([0-9]*)\.([0-9]*)/);
		if (blackberryVersion[1] >= 10 && blackberryVersion[2] >= 3) {
			metaViewport = document.querySelector('meta[name=viewport]');
			if (metaViewport) {
				if (metaViewport.content.indexOf('user-scalable=no') !== -1) {
					return true;
				}
				if (document.documentElement.scrollWidth <= window.outerWidth) {
					return true;
				}
			}
		}
	}
	if (layer.style.msTouchAction === 'none' || layer.style.touchAction === 'manipulation') {
		return true;
	}
	firefoxVersion = +(/Firefox\/([0-9]+)/.exec(navigator.userAgent) || [undefined, 0])[1];
	if (firefoxVersion >= 27) {
		metaViewport = document.querySelector('meta[name=viewport]');
		if (metaViewport && (metaViewport.content.indexOf('user-scalable=no') !== -1 || document.documentElement.scrollWidth <= window.outerWidth)) {
			return true;
		}
	}
	if (layer.style.touchAction === 'none' || layer.style.touchAction === 'manipulation') {
		return true;
	}
	return false;
};
FastClick.attach = function (layer, options) {
	return new FastClick(layer, options);
};
// if (typeof define === 'function' && typeof define.amd === 'object' && define.amd) {
// 	define(function () {
// 		return FastClick;
// 	});
// } else if (typeof module !== 'undefined' && module.exports) {
// 	module.exports = FastClick.attach;
// 	module.exports.FastClick = FastClick;
// } else {
// 	window.FastClick = FastClick;
// }
export default FastClick;
